You will have to look around for someone to help you make a custom ROM. There is a lot of upfront development required even to cook a ROM in a kitchen and even more steps before someone can even think of building something like PA for an unsupported device.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?